Sun openxVM Virtualization

Xen + OpenSolaris - OpenxVM
Xen + Oracle Linux - Oracle VM
Xen + RHEL - RedHat Virtualization
VMware + RHEL + VirtualCenter - VMware Infrastructure / VMware ESX, etc.
Xen technology + Windows 2008 + Stuff - Windows 2008 Server Virtualization.
KVM + Linux + modified qemu - Kernel Based Virtual Machine

VMware Server, Microsoft VirtualPC / Virtual Server and VirtualBox - free!

Anyone see a pattern here? ;-\.

Virtualization is the new Java!!! There's hypervisors and emulators everywhere!